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A young boy looks at a Hyundai Equus car at an auto exhibition in Beijing in this 2009 file photo. Even in China, where per capita income has doubled in 10 years, happiness levels haven't budged, according to a new study.

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Raising a country from poverty to affluence should make the nation's population happier, right? Wrong, according to a new study of 54 countries worldwide.

"Happiness doesn't increase with the rate of economic growth even in less-developed countries or transitional countries," Easterlin told LiveScience. "We already know that to be true of developed countries, but now it's been extended to countries of lower levels of income."

Almost 40 years ago, Easterlin discovered a strange economic pattern in the United States: If you look at snapshot data, richer people are happier than poorer people, and wealthier countries have more satisfied populations than less well-off nations. But when you look at data collected over time, more income doesn't bring happiness.

"If you look across countries and compare happiness and GDP [gross domestic product] per capita, you find that the higher the country's income, the more likely it is to be happier," Easterlin said. "So the expectation based on point-in-time data is if income goes up, then happiness will go up. The paradox is, when you look at change over time, that doesn't happen." [US is Richest Nation, But Not Happiest]

The 'Easterlin paradox,' as it is known, has been the subject of much academic debate. The new study, Easterlin said, is the broadest finding about the paradox so far. The researchers gathered between 10 and 34 years of happiness data from 17 Latin American countries, 17 developed countries, 11 Eastern European countries transitioning from socialism to capitalism and nine-less developed countries. They found no relationship between economic growth and happiness in any case.

Even in a country like China, the researchers wrote, where per capita income has doubled in 10 years, happiness levels haven't budged. South Korea and Chile have shown similarly astronomical economic growth with no increase in satisfaction.

"With incomes rising so rapidly in these three different countries, it seems extraordinary that there are no surveys that register the marked improvement in subjective well-being that mainstream economists and policy makers worldwide would expect to ﬁnd," the researchers wrote.

Wealth and want

The paradox seems impossible on the surface, but there's good reason happiness and income could be linked in the short-term and not over many years, according to Easterlin. As people's incomes rise, he said, so do their aspirations. When incomes fall, he said, aspirations don't. No one wants to give up the standard of living they've grown accustomed to. So in the short term, an economic collapse is painful, while growth feels good.

"In putting together his dataset, he sort of picks and chooses what he wants to include," Wolfers told LiveScience. The surveys Easterlin and his colleagues analyzed asked questions about life satisfaction in different ways and can't be lumped together, Wolfers said.

"What he's got is noisy data," Wolfers said. "In noisy data, it can be hard to find a significant correlation, but that doesn't mean the result is zero."

Editor's note: This article has been updated to include Wolfers' response.